Power-off protection circuit of optical display television

Abstract

The invention relates to a power-off protection circuit for DLP TV, which comprises at least a farad capacitor, a triode transistor Q1, resistors R1 and R2 and at least a socket of an input end and at least a socket of an output end; wherein, the socket of the input end is inserted on power supply; a fan is inserted on the socket of the output end; when the DLP TV works normally, the power supply charges up the farad capacitor through the socket of the input end, the resistor R1 and the triode transistor Q1 and the farad capacitor is fully charged in the start time of the DLP TV and at this time the fan inserted on the socket of the output end can work properly; when the power supply is cut off, the triode transistor Q1 stops, and at this time the farad capacitor discharges the socket of the output end in a single direction and the fan inserted on the socket of the output end can still continue to work. The power-off protection circuit has the advantages that the problem of break-off of the fan caused by sudden power cut is thoroughly solved, which means that after the power is suddenly cut off, the fan continues to rotate so as to protect the life of a bulb and a whole machine; in addition, the circuit is simple in fabrication, easy in debugging, convenient in remanufacturing and low in cost.

Description

technical field [0001] The invention relates to a light-display rear-projection television, in particular to a power-off protection circuit for a light-display television. Background technique [0002] Light display rear projection TV generally adopts DLP (Digital Light Processing, digital light processor), LCOS (Liquid Crystal On Silicon, liquid crystal on silicon), LCD (liquid crystal display, liquid crystal display) three technologies, but all need light source bulbs, The light bulb needs sufficient time and air volume to dissipate heat, so that the life of the light bulb will be longer; the main chip corresponding to the imaging of the whole machine also needs an exhaust fan to dissipate heat to ensure its life. Under normal circumstances, after the remote shutdown, the exhaust fan continues to rotate for tens of seconds to dissipate the heat from the light bulb and the main imaging chip, and at the same time, the exhaust fan discharges the hot air in the chassis out of ...

AI Technical Summary

Problems solved by technology

If the power is suddenly cut off due to external or human reasons, and the exhaust fan stops, the temperature of the bulb will be too high to get heat dissipation, which will affect the life of the bulb, and the hot air of the whole machine will not be discharged outside the chassis, which will also affect the imaging main chip, etc. life span

Images